Thermally Stimulated Depolarization Current Analysis of Stored Charge in LDPE and XLPE

R. C. Walker, H. Hamedi, R. Rajagopalan, M. Lanagan, W. H.Hunter Woodward

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Crosslinked polyethylene (XLPE) is a common material for power cable insulation due to its low cost, mechanical stability, and insulating nature. It is made by converting low-density polyethylene (LDPE) to a crosslinked variant using the chemical agent dicumyl peroxide (DCP). However, the crosslinking process leaves behind byproducts that may compromise the utility of the XLPE. For example, they can contribute to space charge buildup and degradation over time. Here, the thermally stimulated depolarization current (TSDC) technique is used to analyze the susceptibility of XLPE to charge buildup and the origins of the stored charge. Comparisons to LDPE are made to determine if DCP byproducts play a role. In general, three peaks are observed in both XLPE and LDPE, with only one being observed above room temperature. That homocharge peak arises from charge injection that occurs during poling, and has greater magnitude in LDPE than in XLPE. It's magnitude in XLPE can be controlled by the applied field, but the same cannot be said for LDPE. For the two other peaks observed, one is potentially attributable to polymer motion or glass transition phenomena, while the origin of the other is currently speculated to be related to moisture content.

Original languageEnglish (US)
Title of host publication2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2019 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages422-425
Number of pages4
ISBN (Electronic)9781728131214
DOIs
StatePublished - Oct 2019
Event2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2019 - Richland, United States
Duration: Oct 20 2019Oct 23 2019

Publication series

NameAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Volume2019-October
ISSN (Print)0084-9162

Conference

Conference2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2019
CountryUnited States
CityRichland
Period10/20/1910/23/19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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    Walker, R. C., Hamedi, H., Rajagopalan, R., Lanagan, M., & Woodward, W. H. H. (2019). Thermally Stimulated Depolarization Current Analysis of Stored Charge in LDPE and XLPE. In 2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2019 - Proceedings (pp. 422-425). [9009651] (Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP; Vol. 2019-October). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CEIDP47102.2019.9009651